Buggy code:
public class HTMLDocumentImpl extends DocumentImpl implements HTMLDocument { private static final long serialVersionUID = 4285791750126227180L ; private HTMLCollectionImpl _anchors ; private HTMLCollectionImpl _forms ; private HTMLCollectionImpl _images ; private HTMLCollectionImpl _links ; private HTMLCollectionImpl _applets ; private StringWriter _writer ; private static Hashtable _elementTypesHTML ; private static final Class [ ] _elemClassSigHTML = new Class [ ] { HTMLDocumentImpl . class , String . class } ; public HTMLDocumentImpl ( ) { } public synchronized Element getDocumentElement ( ) { } public synchronized HTMLElement getHead ( ) { } public synchronized String getTitle ( ) { } public synchronized void setTitle ( String newTitle ) { } public synchronized HTMLElement getBody ( ) { } public synchronized void setBody ( HTMLElement newBody ) { } public synchronized Element getElementById ( String elementId ) { } public NodeList getElementsByName ( String elementName ) { } public final NodeList getElementsByTagName ( String tagName ) { } public final NodeList getElementsByTagNameNS ( String namespaceURI , String localName ) { } public Element createElementNS ( String namespaceURI , String qualifiedName , String localpart ) throws DOMException { } public Element createElementNS ( String namespaceURI , String qualifiedName ) { } public Element createElement ( String tagName ) throws DOMException { } public Attr createAttribute ( String name ) throws DOMException { } public String getReferrer ( ) { } public String getDomain ( ) { } public String getURL ( ) { } public String getCookie ( ) { } public void setCookie ( String cookie ) { } public HTMLCollection getImages ( ) { } public HTMLCollection getApplets ( ) { } public HTMLCollection getLinks ( ) { } public HTMLCollection getForms ( ) { } public HTMLCollection getAnchors ( ) { } public void open ( ) { } public void close ( ) { } public void write ( String text ) { } public void writeln ( String text ) { } public Node cloneNode ( boolean deep ) { } private Element getElementById ( String elementId , Node node ) { } private static synchronized void populateElementTypes ( ) { } private static void populateElementType ( String tagName , String className ) { try { HTMLDocumentImpl . _elementTypesHTML . put ( tagName , ObjectFactory . findProviderClass ( ( "org.apache.html.dom." + className ) , HTMLDocumentImpl . class . getClassLoader ( ) , true ) ) ; } catch ( Exception except ) { <START_BUG> new RuntimeException ( ( ( ( ( ( ( ( "HTM019<seq2seq4repair_space>OpenXML<seq2seq4repair_space>Error:<seq2seq4repair_space>Could<seq2seq4repair_space>not<seq2seq4repair_space>find<seq2seq4repair_space>or<seq2seq4repair_space>execute<seq2seq4repair_space>class<seq2seq4repair_space>" + className ) + "<seq2seq4repair_space>implementing<seq2seq4repair_space>HTML<seq2seq4repair_space>element<seq2seq4repair_space>" ) + tagName ) + "\n" ) + className ) + "\t" ) + tagName ) ) ; <END_BUG> } } }

Fix:
throw new RuntimeException ( ( ( ( ( ( ( ( "HTM019<seq2seq4repair_space>OpenXML<seq2seq4repair_space>Error:<seq2seq4repair_space>Could<seq2seq4repair_space>not<seq2seq4repair_space>find<seq2seq4repair_space>or<seq2seq4repair_space>execute<seq2seq4repair_space>class<seq2seq4repair_space>" + className ) + "<seq2seq4repair_space>implementing<seq2seq4repair_space>HTML<seq2seq4repair_space>element<seq2seq4repair_space>" ) + tagName ) + "\n" ) + className ) + "\t" ) + tagName ) ) ;